Really long AF *TMI*

So AF was over a week late and when she showed it was super light for the first 3 of 4 days, which never happens, it's normally the opposite. Anyways, at day 6 I thought it was over barely nothing on my tampon and nothing when whiping so I just put a liner in and called it a day. A few hours after that I started bleeding fairly heavy so I put a tampon in... I've now been on AF for 10 days... Which is the longest I've ever had her I normally last anywhere from 4-6 days. Has this happened to anyone? I have no idea why it's lasting so long this cycle? Last night it was fairly light I thought I was done so I checked my cervix and it was super soft but this morning I'm back to bleeding about medium flow. Sorry for TMI